from rest_framework import serializers

from goods.models import SKU


class CartSerializer(serializers.Serializer):
    """
    购物车序列化器
    """
    sku_id = serializers.IntegerField(label='商品SKU编号', min_value=1)
    count = serializers.IntegerField(label='数量', min_value=1)
    selected = serializers.BooleanField(label='勾选', default=True)

    def validate(self, data):
        # 请求方式为post请求，view那传过来的是data
        try:
            sku = SKU.objects.get(id=data['sku_id'])
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')
        return data


class CartListSerializer(serializers.ModelSerializer):
    """
    购物车商品序列化器
    """
    count = serializers.IntegerField(label='数量')
    selected = serializers.BooleanField(label='是否勾选')

    class Meta:
        model = SKU
        fields = ['id', 'count', 'name', 'default_image_url', 'price', 'selected']


class CartDeleteSerializer(serializers.Serializer):
    """
    删除购物车序列化器
    """
    sku_id = serializers.IntegerField(label='商品SKU编号', min_value=1)

    def validate_sku_id(self, value):
        try:
            sku = SKU.objects.get(id=value)
        except Exception:
            raise serializers.ValidationError('该商品不存在')

        return value
